改良消化富集法提高精原干细胞富集效率的实验研究

目的 建立一种改良的小鼠精原干细胞消化富集方法,为精原干细胞体外长期培养和移植奠定基础.方法 收集120个出生4～d BALB/c新生小鼠的睾丸,平均分为对照组和实验组,分别采用传统的两步消化法(对照组)和改良消化法(实验组)分离消化获得细胞悬液,并种植到铺有明胶的培养皿中,于种植后1h、5h、24h通过差速贴壁法去除体细胞,获得富集的精原干细胞.以Thy-1作为精原干细胞的表面标志,分别在3次差速贴壁前、后采用流式细胞仪检测Thy-1阳性细胞的比例,比较两组精原干细胞的富集效率.结果 实验组和对照组消化所获得的细胞数分别为(3.4±0.5)×105/睾丸和(3.6±0.3)×105/睾丸,无统计学差异(P＞0.05).然而,实验组细胞贴壁具有良好的活性,初次贴壁仅需40～50min,而对照组细胞需要4～5h甚至过夜培养才能贴壁.3次差速贴壁后,实验组Thy-1阳性细胞占睾丸细胞的比例为(56.3±4.7)%,而对照组仅为(32.6±4.2)%,差异具有统计学意义(P＜0.01).结论 改良消化富集法能明显提高睾丸细胞活性和富集效率,可获得大量高度纯化的精原干细胞,为精原干细胞培养和移植奠定基础.

A modified method for improving the enrichment efficiency of spermatogonial stem cell

Objective To establish a modified method for the enrichment of mouse spermatogonial stem cells(SSCs). Methods Total of 120 testes from 4-6 days neonatal mice were collected and randomly divided into two groups such as control group digested with a two-step enzymatic digestion method and experiment group with modified digestion method.Collected cells were plated on culture dish precoated with.0.2%(w/v) gelatin- culture The germ cells were purified and enriched by differential adherence selections at 1 h,5 h ...